Head portion of a toothbrush



FIG. 1 is a front view of a head portion of a toothbrush according to the new design;

FIG. 2 is a right side view thereof, the left side view being the same;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a front perspective view thereof;

FIG. 7 is a rear perspective view thereof;

FIG. 8 is a close up side view of the head portion thereof;

FIG. 9 is a close up rear view of the head portion thereof; and,

FIG. 10 is a close up rear perspective view of the head portion thereof.

The broken lines showing the remainder of the head and a handle are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a head portion of a toothbrush, as shown and described. 